Manufacture of wire screens



(No Model.)

B PRELLER MANUFACTURE OF WIRE SCREENS.

.No. 243,790. Patented July 5,1881.

ENTOR f) ATTORNEY WITNESSES 1% /z. z

UNITED STATES PATENT OFFICE.

FERDINAND PRELLER, OF HAMBURG, GERMANY.

MANUFACTURE OF WIRESCREENS.

SPECIFICATION forming part of Letters Patent No. 243,790, dated July 5,1881,

i Application filed March 14, 1881. (No model.)

To all whom it may concern:

Be it known that I, FERDINAND PRELLER,.

a resident of the city of Hamburg, in the German Empire, have inventedImprovements in the Manufacture of Wire Screens, of which the followingis a specification.

In the wire screens for malt-kilns and other purposes heretofore in usethe connection of the intersecting wires is made by means ofthinnerbinding-oft'\vires,which are placed diagonally across the pointsof intersection of the wires. This has the disadvantage that the ends ofthe thin connecting wires project and act like barbs, so as to injurethe feet of those walking over the screens or coming otherwise incontact therewith. The binding-wires have also the further disadvantagethat they soon wear out, disconnect the main wires of the screens, andrender thereby the whole screen loose and shaky.

The object of this invention is to avoid these defects and connect theintersecting wires of Wire-screens in such a manner that the diagonalbinding-01f wires are entirely dispensed with, and a screen is obtainedwhich is at one side entirely flat and smooth without any projections,so as to be specially adapted for maltkilns, ore-roasting kilns,middlingspurifiers, and grain-separators, as well as for plaincylindrical or conical screens.

Theinvention consists of a screen the lon gitudinal wires of which aremade straight, while the transverse wires are provided with indentationsbelow points of intersection with the longitudinal wires, and retainedby side wires, which secure the reliable interlocking of the wires andthe stifl'ening of the screen.

In the accompanying drawings, Figures 1 and 2 represent, respectively, abottom and an end view of a wire screen made according to my improvedmethod. Fig. 3 is a sectional side elevation of a set of rolls forimparting the proper indentations to the transverse wires of the screen.Fig. 4 is a top view of the rolls; Fig. 5, a'detail vertical transversesection of one of the rolls. Figs. 6 and 7 are vertical longitudinalsections; Fig. 8, an end view, and Fig. 9 a top view, of my improvedwire screen modified in such a manner as to be adapted for malt andother kilns; and Figs. 10 and 11 are, respectively, a sectional frontelevamade according to my method.

tion and a vertical transverse section of the tongs, by which theindentations of the crosswires are closed, so as to be adapted for thewire screens for malt-kilns shown in Figs. 6 to 9. Fig. 12 isanenlargedviewof Fig. 7. Fig. 13 is an enlarged view of' Fig. 1.

Similar letters of reference indicate corresponding parts.

In Figs. 1 and 2 of the drawings is represented a wire screen of simpleconstruction,

The longitudinal wires or are straight throughout, and are firmly heldat equal distances from each other by the transverse wires 11 ed. Themiddle wire,

0, is provided at the points where it passes below the longitudinalwires a with semicircular bends or indentations'by which the wires a areretained in position. The wires b and d are preferably provided withindentations at the points where they pass over the wires a, theindentations serving to bear on the opposite sides of the wires a, so asto secure them, in connection with the wires 0, firmly and reliably inposition. The wires Z) and 61 may, however, be straight, while the wire0 requires in all cases the bends or indentations for the longitudinalwires a. The transverse wires b c d areeithersolderedtogetherorconnected by thin binding-wire wound around the same, asdesired. This wire screen is entirely flat on one side, as shown clearlyin Fig. 2, while on the other side the indentations of the wires 0project somewhat to the under side, the thin binding-wire around thewiresb 0d projecting so little as to exert no injurious influence.

The indentations of the wires 0 are formed by the machine represented inFigs. 3 and 4 of the drawings, which consists, essentially, of tworolls, A and B, that are supported in side standards, D, the rolls beingrevolved by intermeshing gear-wheels of equal size at the ends of theroll-shafts and operated by hand or power, so that the uniform rotationof the rolls is produced. The rolls are provided with transversechannels 9, into which accuratelyfitting filling-pieces f are inserted,which are secured to the ends of the rolls by means of inwardlybent earsf and transverse fastenin gbolts f The bolts f 2 pass through the rollsand are provided with a head at one end and at the opposite end with afastening-nut.

The

filling-pieces f are either of flat shape, so as to be flush with thecircumference of the rolls, or of concave orconveX shape. When the upperroll is arranged with convex filling-pieces, the

' lower roll must be arranged at the same distances with correspondingconcave fillingpieces, while the channels intermediately between theconvex and concave filling-pieces are filled up with flat filling piecesf. In this manner one roll is provided with projections, while the otherroll is provided with grooves, registering therewith, by the jointaction of which the wires are fed through between the rolls and bent orindented at the same time, as shown in Fig. 3. The filling-pieces ff areinterchangeable in the transverse channels of the rolls, so as to admitthe forming of wires having bends of different sizes or at differentdistances from each other, as desired. If a certain uniform size ofindented wires has to be turned out it is preferable to make one rollwith raised portions and the other roll with corresponding grooves, inplace of the rolls with interchangeable filling-pieces. The rolls A andB are preferablyof such width that at the same time a number of wiresmay be passed through between the rolls and he indented at properintervals.

For a number of purposes, such as floors of malt-kilns and the like, thelongitudinal wires are provided with indentations, which, however, arenot made semicircular, as in the tran sverse wires heretofore described,but preferably nearly closed, so as to form an eye or loop, as shown inFigs. 6, 7, and 8. This is quickly accomplished by a set of tongs shownin Figs. 10 and 11, which consists of two fulcrumed jaws, g, the lowerends of which are connected by a screw-nut, 9', having a handle, 9 saidscrew-nut engaging two screw-bolts, one havin g a right-hand, the othera left-hand, thread, which bolts are pivoted to the lower ends of thefulcrumed jaws 9. By turning the screwnut g in one direction the lowerparts of the jaws approach each other, while the upper parts of the jawsare closed.

For exposing the wires to the action of the tongs the indented portionsare placed on a former, h, and retained by a horizontal bracketplate, h,above and by lower seat or rest, h below the same, so as not to shift orotherwise change their position when the indentations are closed up, asshown in Fig. 10. The jaws of the tongs are made wide enough to admitthe bending of a number of wires at the same time. Through the so-loopedwires to are passed stron g transverse wires 1), while thinnertransverse wires are placed into the bends at the upper parts of theloops close to the under side of the wires to, as shown in Figs. 6 and7. The distance between the longitudinal wires a is regulated by shortintermediate pieces, t, which are interposed between the wires 0. Theoutermost ends of the transverse wires 0 are bent into the form of aneye, as shown in Fig. 8,

or are riveted to a flat piece of iron or sheet metal, so as to beretained securely at the edges of a panel of the screen.

' According to the thickness of the interm ediate pieces, z, the spacesbetween the longitudinal wires of the screens can be arranged with moreor less width, while for very close screens it is preferable to use inplace of the intermediate wire pieces, i, thin perforated sheet-metalstrips. I

The transverse wires 1) and c impart to the screen or kiln-floor greatstrength, so that they require to be supported at less points, and offera greater surface for the passage of the hot gases in drying the malt.

As readily seen in Figs. 6 to 9 of the drawings, these screens orkiln-floors are entirely flat on the upper side, and constructed in sucha manner that they do not give out until the longitudinal wires a areentirely worn out at their points of connection with the transversestiffening and supporting wires.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. As a new article of manufacture, a wire screenconsisting of straight wires running in one direction, of transversewires having bonds or indentations at the points of intersections withthe first wires, and of transverse bindingoffside wires, substantiallyas set forth.

2. A wire screen for malt-kilns, floors, and similar purposes,consisting of a series of parallel wires having looped bends, a seriesof stiffening-wires passing crosswise of the said parallel wires throughthe loops thereof, and of binding-off wires passing sidewise of theloops below the main wires, substantially as specified.

3. A wire screen for malt-kilns, floors, and similar purposes,consisting of a series of parallel wires, having loop-shaped bends orindentations, of transverse stiffening and bindin g-off wires passing,respectively, through and sidewise of the loops of the main wires and ofshortintermediate wires connected to the transverse binding-off wires,for keeping the main wires at a proper distance, substantially asdescribed.

4. The method herein described of making wire screens, consisting inbending a series of parallel wires at certain intervals, next closingthe bends, so as to form eyes or loops, then connecting and binding 01fthese wires by straight transverse wires passing through and sidewise ofthe loops, substantially as and for the'purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribin g witnesses.

FERDINAND PRELLER.

Witnesses:

GERARD W. v. NAUROCKE, BERTHOLD ROI.

